Variable Speed Diaphragm Control for Smooth Aperture Transitions
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Solution Overview
Problem
Conventional interchangeable lenses for single-lens reflex cameras are not suitable for shooting moving images, as they fail to achieve smooth diaphragm operation and natural changes in brightness, leading to unnatural image quality due to abrupt aperture value changes.
Innovation Solution
An interchangeable lens system with a diaphragm driving unit that adjusts speed based on aperture values, storing speed information for each aperture range and transmitting it to the camera body to enable optimal diaphragm control for smooth brightness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the diaphragm is driven at the highest speed, then the response speed is improved, but the brightness change becomes unnatural and image quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the diaphragm driving speed variable rather than fixed. The driving speed is dynamically adjusted based on the aperture value range, with the control unit selecting different speed characteristics from storage unit for different aperture ranges. This allows the system to optimize between response speed and brightness smoothness for each specific shooting condition.
Solution Approach 2:
The patent changes the parameter of driving speed based on the aperture value. The storage unit stores multiple speed characteristics corresponding to different aperture value ranges, and the control unit selects the appropriate speed characteristic based on the current aperture value. This parameter change approach enables natural brightness variation while maintaining appropriate response speed.
2Manufacturing precision
If the diaphragm driving speed is reduced for smooth brightness change, then image quality is improved, but the response speed deteriorates
Solution Approach 1:
The system dynamically adjusts driving speed based on aperture value ranges rather than using a fixed low speed. By making the speed variable and context-dependent, the system achieves smooth brightness changes when needed while maintaining faster response when appropriate, resolving the contradiction between speed and smoothness.
Solution Approach 2:
The patent implements parameter changes by storing multiple speed characteristics in the storage unit, each corresponding to different aperture value ranges. The control unit selects the appropriate speed parameter based on the current aperture value, enabling the system to optimize both smoothness and response speed for different shooting conditions.
3Device complexity
If a fixed driving speed is used, then the control system is simple, but it cannot adapt to different aperture values and produces unnatural image quality
Solution Approach 1:
The patent segments the aperture value range into multiple ranges, with each range having its own optimized driving speed characteristic stored in the storage unit. This segmentation allows the system to adapt to different aperture values while keeping the control logic relatively simple - the control unit only needs to determine which range the current aperture value falls into and select the corresponding speed characteristic.
Solution Approach 2:
The patent applies preliminary action by pre-storing multiple speed characteristics in the storage unit, each optimized for specific aperture value ranges. This preparation in advance eliminates the need for complex real-time calculations, allowing the control unit to quickly select the appropriate speed characteristic based on the current aperture value, thus achieving adaptability without excessive complexity.
Data Source
AI summary
A camera body to which an interchangeable lens is mountable includes a receiving unit operable to receive speed information, a first controller unit operable to select a shooting mode from a moving image shooting mode and a still image shooting mode, a second controller unit capable of setting whether to operate in a silent mode provided for a situation where a drive sound of a drive unit in the interchangeable lens is desired to be at a low level during the moving image shooting mode, a third controller unit operable to generate a control signal for changing light amount which is changed by a diaphragm in the interchangeable lens, at a constant speed based on the speed information, when the moving image shooting mode is selected and the silent mode is not set, and a body transmitting unit operable to transmit the generated control signal to the interchangeable lens.